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Mediant 2000 SIP
Mediant 2000 SIP User’s Manual 152 Document #: LTRT-72504
8.10 Trunk to Trunk Routing Example
This example describes two Mediant 2000 gateways, each interface with the PSTN through four
E1 spans. Gateway "A" is configured to route all incoming TelIP calls to gateway "B". Gateway
"B" generates calls to PSTN on the same E1 Trunk as the call was originally received (in gateway
"A").
Gateway "A" IP address is 192.168.3.50
Gateway "B" IP address is 192.168.3.51
Ini File Parameters of Gateways "A" and "B”:
1. Define, for both gateways, four trunk groups; each with 30 B-channels:
TrunkGroup_1 = 0/1-31,1000
TrunkGroup_2 = 1/1-31,2000
TrunkGroup_3 = 2/1-31,3000
TrunkGroup_4 = 3/1-31,4000
2. In gateway "A”, add the originating Trunk Group ID, as a prefix, to the destination number,
for TelIP calls:
AddTrunkGroupAsPrefix=1
3. In gateway "A", route all incoming PSTN calls, starting with the prefixes 1, 2, 3 and 4, to
gateway’s "B" IP address:
Prefix = 1, 192.168.3.51
Prefix = 2, 192.168.3.51
Prefix = 3, 192.168.3.51
Prefix = 4, 192.168.3.51
Note: It is also possible to define "Prefix = *,192.168.3.51" instead of the four lines above.
4. In gateway "B", route IPPSTN calls to Trunk Group ID according to the first digit of the
called number:
PSTNPrefix = 1,1
PSTNPrefix = 2,2
PSTNPrefix = 3,4
PSTNPrefix = 4,4
5. In gateway "B", remove the first digit from each IPPSTN number, before it is used in an
outgoing call:
NumberMapIP2Tel = *,1